Exhaust-nozzle cover



May 12, 1925.

H. A. CAMPBELL EXHAUST NOZZLE COVER Filed June 3o, 1924 Patented May 12, 1925.

UNITED STATES HARRY A. CAMPBELL, OF PORTLAND, OREGON.

'EXHAUST-NOZZLE COVER.

Application filed June 30, 1924. Serial No. 723,425.

To (all (U/m it may concern:

Be it known that I, HARRY A. GAMPBELL,

a citizen of the United States, residing at Portland, in the county of Multnomah and 5 State of Oregon, have invented certain new and useful Improvements in Exhaust-Nozzle Covers, of which the following is a specilication.

This invention relates to the exhaustnozzles of locomotives and apparatus for automatically operating the same.

The object of my invention, is the provision of simple and practical automatic means to close the exhaust nozzle of a locoi'notive against the entrance of dust-bearing gases from the smoke-box to the enginevalves when the locomotive is drifting or the steam is cut off from the cylinders and suction is generated therein.

A further object of the invention is to provide a hinged cover for the exhaust nozzle of a locomotive and to provide means to actuate the same in coordination with steam-operated power: devices for controlling the super-heater damper whereby said cover and damper may be opened and closed in unison and a considerable saving in steam consumption is effected in addition to the protection to the valve and cylinder 30 parts from the smoke gases.

Further objects and advantages residing in my invention will be readily apparent in the course of the description hereinafter given of the invention.

The invention consists in the novel construction of an exhaust nozzle cap and cover and the adaptation and combination therewith of steam actuated controlling devices, as will be fully described in the following specification, illustrated in the accompanying drawings, and finally pointed out in the appended claims.

In said drawings, Figure 1 is a view in vertical cross section of a locomotive boiler showing appa 'atus embodying my invention mounted thereon.

Fig. 2 is a fragmentary longitudinal secthrough the boiler wall where it is jornaled in a bearing 10 fixedly secured exteriorly of the boiler. A cover-plate 11 is keyed or otherwise secured to said rod between said ears and is formed and disposed to effectively close the nozzle-bore when in its lowered position.

Exteriorly of the boiler a steam-cylinder 12 is provided including a piston 13 having a stem 15 slidably received in a tubular extension 16 of said cylinder. Said stem is provided with rack-teeth 17 upon one side with which a. toothed segment 18 is meshed. Said segment is keyed to a mandrel 2O supported for rotation in a steam-packed braolcet-box 21.

A lever-arm is secured to said mandrel 20 and a crank-arm 23 upon said rod 8 is operatively connected therewith by a link 25. The lower portion of said cylinder 12 is connected by a steam-pipe 26 with the live steam-pipe (not shown) leading to the main steam-cylinders (not shown) of the. engine whereby the opening of the engineers main throttle will cause steam under pressure to flow to the cylinder 12 simultaneously with the entrance of steam to the main steam-valves of the engine and thereby cause the piston 13 to move upwardly in said cylinder 12 and the arm 22 to swing at its outer end to rock the rod 8 and raise the cover-plate from the nozzle opening 3 previous to the exhaust of steam therethrough and hold .it in its open positiou during the presence of steam-pressure in the cylinder 12.

A counterweight 27 is secured to said rod 8 exteriorly of the boiler-shell, being secured at adjusted positions upon an arm 28 pinned to said rod and serves to balance the weight of said cover.

Said cylinder 12 and operative parts have been previously employed in substantially analogous use to actuate a damper 3O coutrolling the opening from a superheater flue-chamber 31 to the smoke-box and whereby the passages through the superheater 32 are opened or closed to the furnace-draft.

Said damper is mounted upon a rod 33 rotatably mounted in parallel relation to said rod 8 and extends outwardly of the boiler shell where a crank-arm 35 thereon is connected by a link 36 to the said lever arm 22. A counterweight 37 is connected to said rod 33 in an analogous manner to the counterweight 27 and serves to swing the damper and cover 11 into closed positions when the steam pressure is relieved.

It will be seen that upon the opening of the engine throttle both the cover 11 and the damper 30 are opened simultaneously and are similarly closed and at all times are actuated in unison. It is likewise evident that when the locomotive is drifting, the steam throttle being closed to allow the cover-plate 11 to seat upon the exhaust nozzle, that an entire economy of steam is efiected and a total avoidance of the danger of drawing into the cylinders any smoke or combustion gases with their accompanying dust to carbonize the lubrication and destroy the valve parts and packing.

Other advantages residing in the employment of my improved exhaust nozzle cover apparatus is that the use of relief valves or a drifting throttle is obviated. Also it may be employed with any type of ex haust nozzle in common use and is particularly advantageous where trailer-booster apparatus is utilized on the locomotive, or in the Mallet type of engine.

I claim:

1. In a locomotive boiler, the combination of an exhaust nozzle, a cover hingedly connected to close said nozzle, said cover mounted upon a rotatable rod extending outwardly of the boiler shell, a steam cylinder connected with a source of steam supply undcr pressure controlled by the main engine throttle, and operative connections between said cylinder and said rod to open and close said nozzle through said cover.

2. I11 a locomotive boiler, the combination of an exhaust nozzle, a rod rotatively mounted in said boiler and extending exteriorly of the boiler shell, a cover secured on said rod to open and close said exhaust nozzle, a steam cylinder and operative connections whereby said rod may be actuated by the opening of the main engine throttle to raise said cover, and a counterweight to lower said cover when the steam supply is cut off from said cylinder.

3. In a locomotive boiler, the combination of an exhaust nozzle, a rod rotatively mounted in said boiler and extending outside of the boiler shell, a cover on said rod adapted to close said nozzle, a second rod rotatively mounted in said boiler in parallel with said first named rod and extending outside of the boiler shell, a superheater damper connected to said second named rod, a steam-cylinder and operative connections whereby said rods may be actuated through the main engine throttle to open said cover and damper in unison, and automatic means to actuate said rods to close said cover and damper when the steam supply is cut oil? from said cylinder.

4. In a locomotive boiler, the combination with an exhaust nozzle and a damper controlling the draft through the locomotive superheater, of a cover for said nozzle, and operative steam-controlled means whereby said cover and said damper are opened and closed in unison.

In testimony that the foregoing specification is a true description of my invention, I have hereunto set my hand and seal this 9th day of February, 19%, at Portland, Oregon.

I-IAR-RY A. CAMPBELL. 

